Hey hope i can get some help. Have seen this same problem discussed here before but despite extensive thread surfing can not see answers relating to my machine. Dont know if that is because I cant recognize them or if they arent there.

Machine is TMC-5, Fanuc 6T controller, version 902, series 5 flashes on start up. Have added pictures of boards if they help.

Do I have a battery that needs replaced? Dont know where i would find it, cant see one on the boards.
I have the maintenance manuals, if i reset the memory as suggested in other posts, can I trust the machine to run with factory settings or are these "tuned" after installing?

Thanks in advance for anything; help, suggestions, resources.